Albumose-silver-ammonio products.



UNITED STATES PATENT OFFICE.

GEORG- WICI-IMANN, OF BERLIN, GERMANY, ASSIGNOR T0 CHEMISCHE FABRIK AUF ACTIEN, (VORM. E. SGHERINGQ OF BERLIN, GERMANY.

ALBUMOSE-SILVER-AMMONIO PRODUCT.

No Drawing.

To all whom it may concern Be it knownthat I, GEoRe WICHMANN, chemist, doctor of philosophy, citizen of the German Empire, residing at Berlin, Kingdom of Prussia, German Empire have invented a new and useful Improvement in Albumose Silver Ammonio Products, of which the following is a specification.

The application Serial No. 4%,268 de scribes new alkaline albumose silver com-- pounds produced by the action of albumose upon the double compounds obtained from silver salts and organic bases such as ethylene diamin, piperazin and the like. I have now discovered that very useful albumose silver compounds are obtained if in place of the double compounds of silver salts and organic bases there are employed silverammonio compounds (see Dammers Handbuch cZcr Anorgaaischen Ohcmie, Vol. 2, pages 801, 803, 812, S1 1 and 822).

In general the new products which con tain masked silver, are obtained by causing albumose to react upon silver-ammonio compounds. The albumose employed for the production of this new compound is soluble in water and insoluble in alcohol and is obtained by the action of a digestive ferment, such as pepsin or pancreatin, or a suitable acid, or superheated water upon albumin which is derived from meat and is soluble in water. For instance albumose or its solution is added to an aqueous solution of the silver-ammonio compound, the solution preferably filtered and evaporated to dryness in cacao or precipitated by suitable reagents.

Examples.

1. Siloer-nitrate-ammonio-albumose. In order to produce a solution of AgNO 2NH, 23 liters of normal ammonia solution are added to 11.5 liters of a normal silver nitrate solution. By dissolving 15.4; kilograms of albumose therein, and concentrating in cacao a brown precipitate of silver-nitrate-ammonio-albumose is obtained which contains about 7 per cent. of metallic silver. This compound is easily soluble in water with an alkaline react-ion.

2. Siloer-suZfate-ammonioalbumose-18 kilograms silver sulfate are dissolved in 46 liters of normal ammonia solution. kilograms albumose are added thereto and the mixture stirred until solution is complete Specification of Letters Patent.

Application filed June 17, 1910.

Patented Sept. 5, 1911.

Serial No. 567,412.

the solution is then filtered, and evaporated in cacao at a low temperature to dryness.

3. Silver-phosphate-ammonioalbumose.- 2 kilograms silver nitrate in aqueous solution are precipitated by the addition of a solution of sodium phosphate. The precipitate is after separation by suction and washing dissolved in an excess of ammonio, 8.8 kilograms of albumose are added, the insoluble residue removed by filtration and the solution evaporated to dryness in cacao.

4. Silver om'd ammonio albumose. 2 kilograms AgNO in aqueous solution are precipitated with caustic soda; the oxid after having been washed with water is dissolved in ammonia and then stirred for a long time with 15 kilograms albumose, filtered and brought to dryness in cacao.

5. Silver-curbonataammoaio-album0se. The moist silver oxid obtained in the previous example is while suspended in water transformed into carbonate by carbonic acid. By the addition of liters of normal ammonia solution, a solution is ob tained which is stirred with 15 kilograms albumose. A small insoluble residue is removed by filtration and the solution is evaporated in cacao.

6. Silver-chloricZ-ammonioalbumose.12 liters of a normal salt solution are added to 12 liters of a normal silver nitrate solution. The precipitated silver chlorid is repeatedly washed with water and then dissolved in about 15 liters ammonia solution. 15 kilograms albumose are dissolved therein and the whole evaporated to dryness.

The new products may also be made by dissolving albumose in ammonia adding the salt of silver and then evaporating or precipitating. For example in order to manufacture silver nitrate ammonio albumose 15.4 kilograms albumose are dissolved in 23 liters of normal ammonia solution, slowly adding to the solution while stirring 11.5 liters of normal silver nitrate solution and evaporating in cacao.

The products obtained in this manner are light to dark brown in color and contain about 7 per cent. of metallic silver. On heating to 100 centigrade they become gradually darker and carbonize at a higher temperature. They dissolve in one to two parts of water to a syrup like liquid which froths on stirring; the liquid can be thinned with any desired quantity of water and has ammonium sulfid or of common salt.

an alkaline reaction. The aqueous solution does not even on warming coagulate solutions of albumin. No precipitate takes place either on the addition of a solution of Hydrochloric acid gives a precipitate which is again dissolved with a-large excess. On distilling wit-h caustic alkalis the aqueous solution gives ofi the ammonia.

I claim as my invention: 7

1. As a new product, the herein described combination of'a silver-ammonio compound and albumose which is soluble in water and insoluble in alcohol, the same being a brownish powder which contains the silver in a masked state, dissolves easily in water with alkaline reaction, and gives off the ammonia on distilling the aqueous solution with a caustic alkali, substantially as set forth.

2. As a new product, the herein described silver-nitrate-ammonio-albumose, the same being a brownish powder which contains seven per cent. of metallic silver in a masked state, dissolves easily in water with alkaline reaction, and gives off the ammonia on distilling the aqueous solution with a caustic alkali, substantially as set forth.

3. The herein described process of manufacturing the herein described combinations of a silver-ammonio compound and albumose, which consists in causing albumose which is soluble in water and insoluble in alcohol to react upon a silver-ammonio compound, substantially as set forth.

4. The herein described process of manufacturing the herein described silver-nitrateammonio-albumose, which consists in cansing albumose which is soluble in water and insoluble in alcohol to react upon silver-nitrate-ammonia, substantially as set forth.

In testimony whereof I hereunto set my hand in the presence of two subscribing witnesses.

' GEORG WICHMANN. Witnesses:

HENRY HAsPER, VVOLDEMAR HAUPT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

